Codename KND: Operation B.E.S.T. was an MMORPG style game on the Cartoon Network Website created and shut down in 2005. This game's purpose was for the player to create their own KND Operative to take on missions as a member of Sector V to gain points for a high score. Operation B.E.S.T. lasted until someone gained the highest score. After the game's highest score was displayed on TV, it was shut down forever. Minus a commercial and a few screenshots, little other information on the game is available. After the game closed down, the player with the highest score was revealed on a television episode to be a player from Hawaii named "Ninja Z". Nothing else is known about the identity of "Ninja Z".

On March 24, 2018, YouTube user Les Bird uploaded 2 episodes of gameplay from the Operation B.E.S.T. He later uploaded the game file onto his website.[1]